this bicycle, through how many revolutions per minute are the wheels turning ?
2007-01-18 10:48:20 · 5 answers · asked by zenith 1 in Science & Mathematics ➔ Mathematics
Circumference of wheel = pi * D = 3.142 * 26 = 81.692 in
Converting to feet = 81.692/12 = 6.8 ft
35mph=35*5280ft/hr=35*5280/60 ft per min = 3080ft per min
Dividing by circumference = 3080/6.8 = 452.94 rpm
QED
2007-01-18 11:06:58 · answer #1 · answered by Kool-kat 4 · 2⤊ 0⤋
well lets start with the diameter of the wheel, its Pi D or Pi x diameter or 81.68", or 6.807' now if you are going 35 miles an hour and there are 5280' in a mile you are going 184800' in an hour divided by 60 is 3080 feet per min now if you divide 3080 by 6.8 you get 452.9 now all things considered and taking some liberties on rounding off that's your answer. The more digits you use for Pi etc. but that the process.
2016-05-24 04:52:01 · answer #2 · answered by ? 4 · 0⤊ 0⤋
You need to find the circumference using the diameter of the bicycle. Circumf. = 3.14 * diameter
26 * 3.14 = 81.64"
Then you need to find the number of inches in a mile. = 63 360"
Then divide the circumference (81.64") by 63 360". This gives you the number of revolutions in a mile. = 776.09 rounded to = 776
then you multiply 776 * 35 to give you the number of revolutions at the speed of 35 mph = 27 160
Finally you have to divide 27 160 by 60 to get the revolutions per minute = 452.667
rounds to 453 revolutions per minute
2007-01-18 11:16:20 · answer #3 · answered by John 1 · 1⤊ 0⤋
C = πd = 26*3.14159 = 81.6184 in.
(35 miles/1 hr)(5,280 ft/1 mi.)(12 in./1 ft.)(1 hr./60 min)/(81.6184 in/ 1 rev) = 452.49 rpm
2007-01-18 11:05:02 · answer #4 · answered by Helmut 7 · 2⤊ 0⤋
452.4887 RPM is the answer
2007-01-18 15:34:45 · answer #5 · answered by coollovablechap 1 · 0⤊ 1⤋